//
//  MainTabBar.swift
//  SinaWeibo
//
//  Created by liyue on 15/11/8.
//  Copyright © 2015年 李越. All rights reserved.
//

import UIKit

class MainTabBar: UITabBar {

    override init(frame: CGRect) {
        
        super.init(frame: frame)
        setupUI()
    }

    required init?(coder aDecoder: NSCoder) {
//        fatalError("init(coder:) has not been implemented")
        super.init(coder: aDecoder)
    }
    
    private func setupUI() {
        
        addSubview(composeBtn)
    }

    override func layoutSubviews() {
        
        super.layoutSubviews()
        
        let w = self.bounds.width / 5
        let h = self.bounds.height
        let rect = CGRectMake(0, 0, w, h)
        
        var index: CGFloat = 0
        for subView in subviews {
            
            if subView.isKindOfClass(NSClassFromString("UITabBarButton")!){
                
                subView.frame = CGRectOffset(rect, index * w, 0)
                
                index += index == 1 ? 2 : 1
            }
        }
        
        composeBtn.frame = CGRectOffset(rect, w * 2, 0)
        bringSubviewToFront(composeBtn)
    }
    
    //懒加载 加号
    lazy var composeBtn: UIButton = {
        
       let btn = UIButton()
        
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)
        
        btn.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)
        btn.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        return btn
    }()
}
